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The quantitative composition of the essential oils from two different Sideritis (Labiatae) species (S cladestina spp cyllenea and S sipylea) is reported. Over 80 components have been identified in each species by means of GC and GCMS analysis, and a number of substances have been identified for the first time in these essential oils.

The essential oil of ORIGANUM DICTAMNUS L. was obtained by steam distillation with a yield of 0.8% of dry material. The oil was investigated after fractionation on a silica gel column and separation of phenols, by combination of GLC-mass spectrometry. In the analysis, 30 components were found accounting for 98.28% of the oil, the predominating compounds being carvacrol; gamma-terpinene, P-cymene, caryophyllene, borneol, terpin-1-en-4-ol, and carvacrol methyl ether.